Its all brass, three jaw clutch mechanism gives excellent support for the pencil lead. In addition, the Pentel Graph 1000's center of gravity is close to the writing tip. Well designed and ergonomic, it's a favorite for drafting.

Best mechanical pencil I have ever owned. Definitely worth the money.
Comfortable, solid, mechanically sound. The lead hardness indicator could have
been made stiffer, so that it would not turn inadvertently.

I previously reviewed this pencil as having a modified rubber grip/sleeve. Upon
further inspection I found that there was little if any difference between the
Graph 1000 I bought previously and therefore retract that somewhat negative
review.

I just received two of these pencils from JetPens. It turns out they are
essentially the same model as before, but instead of having rubber grips inlaid
into the hard plastic barrel, they have an entire rubber sleeve with raised
ridges simulating the original grip pattern. This probably doesn't change the
operating characteristics of the pencil, but for me, this simpler design used in
many cheaper mechanical pencils means that the Pentel Graph 1000 for Pro looses
a considerable amount of its cachet.